河南理工大学能源科学与工程学院;山西省地质勘查局二一七地质队有限公司;山西沁盛煤层气作业有限责任公司;
为了查明超临界状态下的CO2(ScCO2)对煤有机组成和结构的影响规律,开展了ScCO2对不同煤阶煤的萃取试验研究,比较了萃取前后煤的主要官能团与大分子结构参数的差异,探讨了ScCO2对煤中低分子化合物和有机结构的影响机制.结果表明:1)煤的芳香结构中苯环取代方式有4种,其中苯三取代占比最高,且随着变质程度的增加,该取代方式占比呈现下降趋势;ScCO2对煤的苯三取代结构溶出效果最好,在低阶煤中苯三取代结构受ScCO2流体大量溶出的影响其占比减小,苯二取代、苯四取代和苯五取代在芳香结构中的占比相对增大,而中高阶煤中苯三取代降低,苯五取代增加.2)随煤变质程度的增加富氧指数(I2)呈下降趋势;ScCO2萃取后,中、低阶煤的含氧官能团相对含量减少,而高阶煤的含氧官能团相对含量增加;ScCO2萃取使得不同煤阶煤的脂肪链均缩短,脂肪链长程度(I3)减小,富氢指数(I1)、脂碳率(fal)在中变质的1/3焦煤达到最大,呈现先增后减的趋势.3)ScCO2作用后,导致部分低分子化合物溶出,引起各类官能团含量的变化,但随煤阶增大其主要官能团类型变化不大;ScCO2的萃取作用,会使得煤的有机分子间的氢键发生断裂,促使其有机大分子结构紊乱、疏松.研究认为ScCO2作用后,煤中主要官能团的变化是各类官能团与ScCO2的溶解作用以及化学吸附和化学反应等综合作用的结果.
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基本信息:
DOI:10.13247/j.cnki.jcumt.20240429
中图分类号:TQ530
引用信息:
[1]张小东,冀海军,亢红东等.超临界CO_2流体作用对不同煤阶煤有机组成和结构的影响机制[J].中国矿业大学学报,2025,54(01):52-64.DOI:10.13247/j.cnki.jcumt.20240429.
基金信息:
国家自然科学基金项目(42172198,42202210)